hgwebdir: break templater -> templater circular reference This is essentially another instance of the same problem fixed by the parent changeset. See its commit message for the details.

Content-type: text/xml; charset={encoding}

<?xml version="1.0" encoding="{encoding}"?>
<rss version="2.0">
  <channel>
    <link>{urlbase}{url}</link>
    <language>en-us</language>